<?php
class JSSDK {
  private $appId;
  private $appSecret;
  private $token;

  public function __construct($appId, $appSecret,$token) {
    $this->appId = $appId;
    $this->appSecret = $appSecret;
	$this->token = $token;
  }

  /* JS-SDK使用权限签名算法 */
  public function getSignPackage() {
    $jsapiTicket = $this->getJsApiTicket();

    // 注意 URL 一定要动态获取，不能 hardcode.
    $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
    $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

    $timestamp = time();
    $nonceStr = $this->createNonceStr();

    // 这里参数的顺序要按照 key 值 ASCII 码升序排序
    $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";

    $signature = sha1($string);
    error_log("add by hutingting jssdk getSignPackage **********************appId**********************".$this->appId,0);	
    $signPackage = array(
      "appId"     => $this->appId,
      "nonceStr"  => $nonceStr,
      "timestamp" => $timestamp,
      "url"       => $url,
      "signature" => $signature,
      "rawString" => $string
    );
	error_log("add by hutingting jssdk getSignPackage **********************signPackage**********************".print_r($signPackage,1),0);	
    return $signPackage; 
  }

  private function createNonceStr($length = 16) {
    $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    $str = "";
    for ($i = 0; $i < $length; $i++) {
      $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $str;
  }

  private function getJsApiTicket() {
    // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
    $data = json_decode(file_get_contents("jsapi_ticket.json"));
    if ($data->expire_time < time()) {
      $accessToken = $this->getAccessToken();
      // 如果是企业号用以下 URL 获取 ticket
      // $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
      $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
      $res = json_decode($this->httpGet($url));
      $ticket = $res->ticket;
      if ($ticket) {
        $data->expire_time = time() + 7000;
        $data->jsapi_ticket = $ticket;
        $fp = fopen("jsapi_ticket.json", "w");
        fwrite($fp, json_encode($data));
        fclose($fp);
      }
    } else {
      $ticket = $data->jsapi_ticket;
    }

    return $ticket;
  }

  public function getAccessToken() {
    $where['appid']=$this->appId;
    $where['appsecret']=$this->appSecret;
	$diymen_set = M('diymen_set')->where($where)->find();
	error_log("add by hutingting jssdk================expire_time = ".$diymen_set['expire_time']);
	error_log("add by hutingting jssdk================time = ".time());
    if ($diymen_set['expire_time'] < time()) {
		error_log("add by hutingting jssdk================get accesstoken from url");
        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
        $res = json_decode($this->httpGet($url));
        $access_token = $res->access_token;
		error_log("add by hutingting jssdk================get accesstoken from url|access_token=".$access_token);
        if($access_token) {
         $data['expire_time'] = time() + 7000;
         $data['access_token'] = $access_token;
         M('diymen_set')->where($where)->save($data); 	
       }
    } else {
	  error_log("add by hutingting jssdk==================get accesstoken from datebase");
      $access_token = $diymen_set['access_token'];
    }
    return $access_token;
  }

  public function httpGet($url) {
	error_log("jssdk==========httpGet|url".$url);
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_TIMEOUT, 500);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($curl, CURLOPT_URL, $url);

    $res = curl_exec($curl);
    
	if (curl_errno($curl)) {  
          echo 'Errno'.curl_error($curl);//捕抓异常  
       } 
	error_log("Add by hutingting------------jssdk|httpGet|".$res,0);
    curl_close($curl);
    return $res;
  }
}

